Many factors affect you hair that are beyond your control. Sun in the summer lightens and absorbs moisture from hair. Winter sometimes has more affects to your hair than most realize. Inside heat and outside wind , cold with rain and snow helps to keep hair dry. One factor affects hair is wool and acrylic coats and scarves, ends can become tangled and split. Trim and moisturize hair during this season regularly as with summer. A regular trim improvethe overall health of your hair . Trim about 4 to 6 times a year for hair growth.